package com.cn.yz.springboot.util.httpcilent;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import org.springframework.util.StringUtils;

public class HttpRequest {
	
	private String s="";
	
	/**
     * 向指定URL发送GET方法的请求
     * 
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
	public static String sendGet(String url, String param){
		String result = "";
		BufferedReader in = null;
		try {
			StringBuffer urlNameString = new StringBuffer(url);
			if(!StringUtils.isEmpty(param)){
				urlNameString.append("?").append(param);
			}
			URL realUrl = new URL(urlNameString.toString());
			// 打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
		} catch (Exception e){
			System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
		} finally {
			try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
		}
		return result;
	}
	
	/**
     * 向指定 URL 发送POST方法的请求
     * 
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
	public static String sendPost(String url,String param){
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			 URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
			// 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("content-type", "application/json");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("connection", "Keep-Alive");
         // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
		} catch (Exception e) {
			System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
		}
		//使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
		return result;
	}

	public static void main(String[] args) {
		//http://localhost:8080/api/next_work_day
		//发送 GET 请求
        //String get =HttpRequest.sendGet("http://localhost:8080/api/query_order", "idCard=&orderDate=&orderNodeId=&orderChannel=&start=0&limit=2");
        //System.out.println(get);
        
		String param = "{\"id\":\"3\",\"node_id\":100,\"node_name\":\"删除\",\"order_num\":100}";
        String post = HttpRequest.sendPost("http://localhost:8080/api/update_node", param);
        System.out.println(post);
	}

}
